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Message: <blockquote data-quote="PlunkettsGhost" data-source="post: 64718" data-attributes="member: 198">The Whale Tale - Part 3Another claim to vestigial status, is that of the whale pelvic girdle, given that whales have no hind legs. However, serious biologists have put paid to the notion that that whale pubic/pelvic bone has no function: "The pelvic girdle is highly reduced and only the remnants of a pubic bone remain. This short, rod-like bone is embedded in the lateral body musculature, oriented in a longitudinal direction. The bones do not attach to the vertebral column and are generally larger in the male than in the female, serving as an attachment for genital muscles.""Male locomotor muscle and pelvic bones grew significantly faster than in females. High growth rates for visceral and reproductive organs in porpoises, relative to other mammals, may underlie their early maturation and support their intensive, annual reproductive schedule.""Growth Patterns of most body components were similar in males and females, with the exception of axial muscle, abdominal muscle, and pelvic bones, for which values were higher in males, and liver, heart, intestines and mesenteric lymph node,for which  values were higher in females."These few examples clearly indicates that the pelvis has a more obvious role in the protection of male organs, specifically prostate, penis and testicles.Another example illustrating the relative growth of pelvis in both male and female whales of sexual maturity, again illustrating a role for both in reproduction:"The male reproductive tract and the pelvic bones, upon which it is anchored, grow at similarly high rates. The pelvic bones provide the skeletal origin for the crura of the broelastic penis of cetaceans. The high growth rates of the pelvic bones suggests that although these elements no longer provide support for hind limbs, they play an important role for support of the external genitalia.""Contrarily, in males, the axial, abdominal and total muscle, and pelvic bones grow at higher rates than in females. These sexual dimorphic ontogenetic allometries seem to prepare each sex for their early maturation and annual reproductive schedule""The abdominal muscle group also includes the rectus abdominus and ischiocaudalis, both of which are anchored to the pelvic bones. The pelvic bones, which grow at a highly accelerated rate relative to those of females, function as the bony anchor for the tissues of the male reproductive tract, including the external genitalia. The male reproductive tract, pelvic bones, and caudal abdominal muscles probably form an integrated unit that functions in supporting copulatory behavior."</blockquote>

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